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Lösung 3.2:4d

Aus Online Mathematik Brückenkurs 2

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For magnitudes of quotients, we have the arithmetical rule

zw=zw.

We can therefore take the magnitude of the numerator and denominator separately and then divide the magnitudes by each other,

3+2i3−4i=3+2i3−4i=32+2232+(−4)2=9+49+16=1325=513. 
Von „http://wiki.math.se/wikis/2009/bridgecourse2-TU-Berlin/index.php/L%C3%B6sung_3.2:4d“